污水渗滤土地处理系统中的堵塞问题

堵塞问题是污水渗滤土地处理系统经常遇到的.从理论方面对悬浮物截留、吸附及微生物生长所造成的堵塞进行了讨论,并用实例进行了验证.结果表明,不管是悬浮物截留、吸附,还是微生物的生长,所造成的堵塞状况都呈现出随滤层厚度增加按负指数形式递减的趋势.系统内部是否会发生堵塞与原水的成分组成、渗滤介质的有关参数、微生物的活性等都密切相关.对于污水渗滤土地处理系统来说,微生物的生长一般不会导致系统内部产生堵塞,而悬浮物的截留、吸附常常会造成系统表层比较严重的堵塞.

Discussion on the problem of clogging in wastewater infiltration land treating systems

Clogging problem is often met in wastewater infiltration land treating systems. In this paper, it is discussed theoretically on the clogging caused by the interception and adsorption of suspend substances and growth of microorganism, and it is confirmed by examples. Results show that, clogging situation caused by interception and adsorption of suspend substances or by growth of microorganism, all tends to decrease with negative exponential from, following the increase of infiltration layer depth. Whether the clogging is appeared in inner of systems or not, it is related closely to the compositions of influent, the related parameters of infiltration mediums and the activity of microorganism. For the wastewater infiltration land treating systems, the growth of microorganism usually will not cause the clogging in inner of systems; but the interception and adsorption of suspend substances often cause serious clogging in the shallow layer of systems.